According to the experimental XRD results, we find the stabilization of Fmm-La\(_{0.5}\) Ce\(_{0.5}\) H\(_{10}\)  superhydride in the pressure range of 140-160 GPa. To examine the superconductivity in the ternary La-Ce-H system, we immediately prepare DAC for S3 for the resistivity measurements. Figure 3(a) shows the photographs of the sample S3 before and after laser heating at 155 GPa. We can also observe the striking expansion of the sample. Raman spectroscopy is effective to detect the atomic structures through probing the vibrational modes. Figure 3(b) shows the Raman spectra of sample S3 after laser heating. The S(1) rotational band and the \(\nu _1\)  vibration mode at around 620 and 4270 cm\(^{-1}\)  indicate the existence of hydrogen inside the whole sample chamber [1]}. The variations in the frequencies of the \(\nu _1\)  mode indicate the slightly anisotropic conditions inside DAC. The excess of the released hydrogen further confirms the formation of the Fmm La\(_{0.5}\) Ce\(_{0.5}\) H\(_{10}\)  phase. The small peak at around 120 cm\(^{-1}\)  is probably due to the vibrations of the heavy elements of La and Ce of the synthesized superhydride phases. This is consistent with the early calculated phonon spectra at around the pressure studied for either LaH\(_{10}\)  [2]}, [3]} or CeH\(_{10}\)  [4]}.
